diff --git a/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp b/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp
index b75dd72eb..6319f8d4a 100644
--- a/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp
+++ b/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp
@@ -156,7 +156,9 @@ constexpr struct {
     {"classic fallback", {}, 1, 1},
     {"", DistanceFieldVectorGL2D::Flag::UniformBuffers, 1, 1},
     {"texture transformation", DistanceFieldVectorGL2D::Flag::UniformBuffers|DistanceFieldVectorGL2D::Flag::TextureTransformation, 1, 1},
-    {"multiple materials, draws", DistanceFieldVectorGL2D::Flag::UniformBuffers, 64, 128},
+    /* SwiftShader has 256 uniform vectors at most, per-draw is 4+1 in 3D case
+       and 3+1 in 2D, per-material 4 */
+    {"multiple materials, draws", DistanceFieldVectorGL2D::Flag::UniformBuffers, 16, 48},
 };
 
 constexpr struct {
diff --git a/src/Magnum/Shaders/Test/FlatGLTest.cpp b/src/Magnum/Shaders/Test/FlatGLTest.cpp
index 715026036..39f2eeaa2 100644
--- a/src/Magnum/Shaders/Test/FlatGLTest.cpp
+++ b/src/Magnum/Shaders/Test/FlatGLTest.cpp
@@ -199,7 +199,9 @@ constexpr struct {
 } ConstructUniformBuffersData[]{
     {"classic fallback", {}, 1},
     {"", FlatGL2D::Flag::UniformBuffers, 1},
-    {"multiple draws", FlatGL2D::Flag::UniformBuffers, 128},
+    /* SwiftShader has 256 uniform vectors at most, per-draw is 4+2 in 3D case
+       and 3+2 in 2D */
+    {"multiple draws", FlatGL2D::Flag::UniformBuffers, 42},
     {"texture transformation", FlatGL2D::Flag::UniformBuffers|FlatGL2D::Flag::Textured|FlatGL2D::Flag::TextureTransformation, 1},
     {"alpha mask", FlatGL2D::Flag::UniformBuffers|FlatGL2D::Flag::AlphaMask, 1},
     {"object ID", FlatGL2D::Flag::UniformBuffers|FlatGL2D::Flag::ObjectId, 1}
diff --git a/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp b/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp
index 7caf1d2f4..3aec29ec1 100644
--- a/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp
+++ b/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp
@@ -215,7 +215,9 @@ constexpr struct {
 } ConstructUniformBuffersData2D[] {
     {"classic fallback", MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 1, 1},
     {"", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 1, 1},
-    {"multiple materials, draws", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 64, 128},
+    /* SwiftShader has 256 uniform vectors at most, per-2D-draw is 4,
+       per-material 4, two need to be left for drawOffset + viewportSize */
+    {"multiple materials, draws", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 8, 55},
     /* The rest is basically a copy of ConstructData2D with UniformBuffers
        added */
     #ifndef MAGNUM_TARGET_WEBGL
@@ -271,7 +273,9 @@ constexpr struct {
 } ConstructUniformBuffersData3D[] {
     {"classic fallback", MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 1, 1},
     {"", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 1, 1},
-    {"multiple materials, draws", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 64, 128},
+    /* SwiftShader has 256 uniform vectors at most, per-3D-draw is 4+4,
+       per-material 4, plus 4 for projection */
+    {"multiple materials, draws", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 6, 28},
     /* The rest is basically a copy of ConstructData2D with UniformBuffers
        added */
     #ifndef MAGNUM_TARGET_WEBGL
diff --git a/src/Magnum/Shaders/Test/PhongGLTest.cpp b/src/Magnum/Shaders/Test/PhongGLTest.cpp
index 520bbb120..66ba51c8d 100644
--- a/src/Magnum/Shaders/Test/PhongGLTest.cpp
+++ b/src/Magnum/Shaders/Test/PhongGLTest.cpp
@@ -218,8 +218,10 @@ constexpr struct {
 } ConstructUniformBuffersData[]{
     {"classic fallback", {}, 1, 1, 1},
     {"", PhongGL::Flag::UniformBuffers, 1, 1, 1},
-    {"multiple lights, materials, draws", PhongGL::Flag::UniformBuffers, 30, 64, 128},
-    {"zero lights", PhongGL::Flag::UniformBuffers, 0, 64, 128},
+    /* SwiftShader has 256 uniform vectors at most, per-3D-draw is 4+4,
+       per-material 4, per-light 4 plus 4 for projection */
+    {"multiple lights, materials, draws", PhongGL::Flag::UniformBuffers, 8, 8, 24},
+    {"zero lights", PhongGL::Flag::UniformBuffers, 0, 16, 24},
     {"ambient + diffuse + specular texture", PhongGL::Flag::UniformBuffers|PhongGL::Flag::AmbientTexture|PhongGL::Flag::DiffuseTexture|PhongGL::Flag::SpecularTexture, 1, 1, 1},
     {"ambient + diffuse + specular texture + texture transformation", PhongGL::Flag::UniformBuffers|PhongGL::Flag::AmbientTexture|PhongGL::Flag::DiffuseTexture|PhongGL::Flag::SpecularTexture|PhongGL::Flag::TextureTransformation, 1, 1, 1},
     {"normal texture", PhongGL::Flag::UniformBuffers|PhongGL::Flag::NormalTexture, 1, 1, 1},
diff --git a/src/Magnum/Shaders/Test/VectorGLTest.cpp b/src/Magnum/Shaders/Test/VectorGLTest.cpp
index 9474bec3e..0d492b8e1 100644
--- a/src/Magnum/Shaders/Test/VectorGLTest.cpp
+++ b/src/Magnum/Shaders/Test/VectorGLTest.cpp
@@ -155,7 +155,9 @@ constexpr struct {
     {"classic fallback", {}, 1},
     {"", VectorGL2D::Flag::UniformBuffers, 1},
     {"texture transformation", VectorGL2D::Flag::UniformBuffers|VectorGL2D::Flag::TextureTransformation, 1},
-    {"multiple draws", VectorGL2D::Flag::UniformBuffers, 128},
+    /* SwiftShader has 256 uniform vectors at most, per-draw is 4+3 in 3D case
+       and 3+3 in 2D */
+    {"multiple draws", VectorGL2D::Flag::UniformBuffers, 36},
 };
 #endif
 
diff --git a/src/Magnum/Shaders/Test/VertexColorGLTest.cpp b/src/Magnum/Shaders/Test/VertexColorGLTest.cpp
index 43fc382b6..e9011fe62 100644
--- a/src/Magnum/Shaders/Test/VertexColorGLTest.cpp
+++ b/src/Magnum/Shaders/Test/VertexColorGLTest.cpp
@@ -132,7 +132,9 @@ constexpr struct {
 } ConstructUniformBuffersData[]{
     {"classic fallback", {}, 1},
     {"", VertexColorGL2D::Flag::UniformBuffers, 1},
-    {"multiple draws", VertexColorGL2D::Flag::UniformBuffers, 128}
+    /* SwiftShader has 256 uniform vectors at most, per-draw is 4 in 3D case
+       and 3 in 2D; one needs to be reserved for drawOffset */
+    {"multiple draws", VertexColorGL2D::Flag::UniformBuffers, 63}
 };
 #endif